You must accept that you might fail then if you do your best and still don't win at least you can be satisfied that you've tried. If you don't accept failure as a possibility you don't set high goals you don't branch out you don't try – you don't take the risk.
Some of my best leading men have been dogs and horses.
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You always want to quit while you are ahead. You don't want to be like a fighter who stays too long in the ring until you're not performing at your best.